/*
 * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
 * derivative works of, display, perform, and distribute the Software and make,
 * use, sell, offer for sale, import, export, have made, and have sold the
 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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 */
package com.oracle.truffle.dsl.processor.java.model;

import java.util.HashMap;
import java.util.Map;

import javax.lang.model.element.Name;

public abstract class CodeNames {

    private static final Map<String, Name> names = new HashMap<>();

    public static Name of(String value) {
        Name name = names.get(value);
        if (name == null) {
            name = new NameImpl(value);
            names.put(value, name);
        }
        return name;
    }

    public static class NameImpl implements Name {

        private final String name;

        NameImpl(String name) {
            this.name = name;
        }

        @Override
        public int length() {
            return name.length();
        }

        @Override
        public char charAt(int index) {
            return name.charAt(index);
        }

        @Override
        public CharSequence subSequence(int start, int end) {
            return name.subSequence(start, end);
        }

        @Override
        public boolean contentEquals(CharSequence cs) {
            return name.contentEquals(cs);
        }

        @Override
        public boolean equals(Object obj) {
            if (obj instanceof Name) {
                return ((Name) obj).contentEquals(name);
            }
            return super.equals(obj);
        }

        @Override
        public int hashCode() {
            return name.hashCode();
        }

        @Override
        public String toString() {
            return name;
        }

    }

}
